Fumarole mineral

Fumarole minerals are minerals which are deposited by fumarole exhalations. They form when gases and compounds desublimate or precipitate out of condensates, forming mineral deposits. They are mostly associated with volcanoes, but have been encountered on burning coal deposits as well. They can be black or multicoloured and are often unstable upon exposure to the atmosphere.

Fumarole formation of tazieffite acicular crystals (black) at Mutnovsky, Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 700 microns.

A number of rare minerals are fumarole minerals, and at least 240 such minerals are known from Tolbachik volcano in Kamchatka, Russia. Other volcanoes where individual fumarole minerals have been discovered are Vulcano in Italy and Bezymyanny also in Russia.

Origin and appearance
Fumarole minerals in SEM images, from Tolbachik volcano in Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 350 microns.

In fumaroles, minerals either form through desublimation from fumarole gases or through interactions of fumarole gases with country rock.[1] The former are known as sublimates and the latter as incrustations.[2] Some such deposits may also form through the interaction between liquid fumarole condensates and country rock[3] and are not always formed by desublimation.[4] Multiple cycles of primary deposition and secondary alteration may occur.[5] Volcanic gases such as hydrogen chloride, hydrogen fluoride, sulfur dioxide and water[6] can transport large amounts of elements, thus contributing to geochemical cycles on the surface and the formation of ore deposits at depth.[7] When these exhalations reach the atmosphere and cool, the minerals contained in them tend to precipitate out.[8] In the Valley of Ten Thousand Smokes in Alaska the fumarole minerals form both thin crusts in the vents and mixtures with tephra deposits.[9]

Burning coal produces enough heat to partially melt rocks and to generate exhalations of the mineral components embedded in coal.[10] Coal seam fires often deposit fumarolic minerals over areas of a few square metres which can be detected by airborne hyperspectral imagery.[11] Coal fires can mobilize toxic trace elements.[12] Fumarole minerals have also been found in Gusev crater on Mars.[13]

Typical components of fumarole minerals are halides, oxides, sulfates and sulfides,[14] with the exact composition different between volcanoes, individual vents at volcanoes and different temperatures of the same vent.[15] Fumarole exhalations are often black or multicoloured, and tend to develop typical zonations. Common components are sulfur compounds and elemental sulfur.[8] Fumarolic minerals are often unstable and are eroded or decompose,[16] in the Valley of Ten Thousand Smokes in Alaska it took less than a century for almost all fumarole mineral deposits to disappear[17] although others remained and were later used to identify former fumarole vents.[18] Thus, many fumarole minerals are rare and many rare minerals are fumarole minerals.[19] Some fumarolic minerals have been found in extinct Cenozoic volcanoes[20] and could exist in Archean rocks as well, however.[21] Unique textures occur such as bubble-like structures, which may form when the liquid that deposits the minerals evaporates.[3]

Fumarole deposits have been used to identify heat flow anomalies and to reconstruct ore genesis processes.[5]

Volcanoes
Electron micrograph images of fumarolic minerals at Mutnovsky volcano, Kamchatka

Research on the mineralogy of fumarole minerals has been conducted in Central America, Russia and Europe,[14] with detailed publications on Izalco in El Salvador,[22] Eldfell in Iceland,[23] Vesuvius[15] and Vulcano in Italy, Mount Usu in Japan, Kudryavy and Tolbachik in Russia, Kilauea and Mount St. Helens in the United States.[14] Sulfur deposits containing fumarolic desublimates are found at Guallatiri and Lastarria volcanoes in the Central Volcanic Zone of the Andes.[24] Kudryavy volcano in the Kurils is particularly known for the numerous mineralizations its fumaroles have produced[25] and for the presence of rhenium-rich precipitates.[2] Among the elements found there are copper-gold-silver alloys.[26] Various sulfate-based minerals have been identified at the Salton Buttes in California.[27] Fumarolic minerals have also been reported from the Western Andes in Bolivia.[28]

The most fumarolic minerals have been found at Tolbachik volcano in Kamchatka, Russia; Tolbachik also has one of the most diverse mineral assemblages in the world.[20] The high temperature and oxidizing regime of exhalations which transport the elements at Tolbachik facilitates mineral deposition.[29] A large assemblage of silicates[30] and a number of copper-zinc selenite chlorides[31] and copper-based fumarolic minerals were discovered at Tolbachik volcano, Kamchatka, Russia. Many of these include polymeric CuO
4 units.[1] About 240 minerals have been identified at Tolbachik,[20] 40 of them only incompletely studied.[32] Elemental gold linked to chlorides at Tolbachik has been interpreted as gold transported by chlorine-rich oxidizing environments.[33] Specimens of fumarole minerals from Tolbachik and Kudryavy are hosted by the Fersman Mineralogical Museum in Moscow.[34]

Historical lava flows of Vesuvius volcano contain fumarolic minerals.[35] Various fumarole minerals have been discovered at Vulcano volcano in Italy, where the mineralogy has changed since 1987 and 1990 due to hotter fumarole exhalations,[36] yielding increased sulfate and sulfur salt concentrations.[37] Fumarolic minerals have also been encountered at mud volcanoes in Siberia.[38]

Minerals discovered in fumarole areas

List of fumarole minerals with discovery site and year:

  • Abramovite (Pb
    2    SnInBiS
    7    ), Kudryavy, Russia. Reported in 2008.[39]
  • Aluminocoquimbite (AlFe(SO
    4    )*
    3    H
    2    O    ), Grotta del' Alume, Vulcano, Italy. Reported in 2010.[40]
  • Aluminopyracmonite ((NH
    4    )
    3    Al(SO
    4    )
    3    ), La Fossa, Vulcano, Italy. Reported in 2018.[41]
  • Arsmirandite (Na
    18    Cu2+
    12    Fe3+
    O
    8    (AsO
    4    )
    8    Cl
    5    ), Arsenatnaya fumarole, Tolbachik, Russia. Discovered in 2020.[1]
  • Baliczunicite (Bi
    2    O(SO
    4    )
    2    ), La Fossa, Vulcano, Italy. Discovered in 2013.[37]
  • Belomarinaite (KNaSO
    4    ), Toludskoe lava field, Tolbachik, Russia. First described in 2019.[42]
  • Belousovite (KZn(SO
    4    )Cl    ), Yadovitaya fumarole, Second Scoria Cone, Tolbachik, Russia. Reported in 2018.[43]
  • Blossite (a-
    Cu2+
    2    V5+
    2    O
    7    ), Izalco, El Salvador. Reported in 1987.[22]
  • Bubnovaite (K
    2    Na
    8    Ca(SO
    4    )
    6    ), Naboko cone, Tolbachik, Russia.[44]
  • Cadmoindite (CdIn
    2    S
    4    ), Kudryavy, Russia. Reported in 2004.[45]
  • Campostriniite ((Bi3+
    ,    Na)
    3    (NH,
    4    K)
    2    Na
    2    (SO
    4    )·
    6    H
    2    O    ), La Fossa, Vulcano, Italy. Reported in 2015.[46]
  • Cannizzarite (Pb
    46    Bi
    54    (S
    ,    Se)
    127    ), La Fossa, Vulcano, Italy.[47]
  • Cesiodymite (CsKCu
    5    O(SO
    4    )
    5    ), Second Scoria Cone, Tolbachik, Russia. Reported in 2018.[48]
  • Chubarovite (KZn
    2    (BO
    3    )Cl
    2    ), Arsenatnaya fumarole, Tolbachik, Russia. Reported in 2015.[49]
  • Cryptocalcite (K
    2    Cu
    5    O(SO
    4    )
    5    ), Second Scoria Cone, Tolbachik, Russia. Reported in 2018.[48]
  • Cupromolybdite (Cu
    3    O(MoO
    4    )
    2    ), New Tolbachik scoria cones, Tolbachik, Russia. Reported in 2012.[50]
  • D'ansite (Na
    21    Mn2+
    (SO
    4    )
    10    Cl    ) Vesuvius and Vulcano, Italy. Reported in 2012.[51]
  • Demartinite (K
    2    SiF
    6    ), La Fossa, Vulcano, Italy. Reported in 2007.[52]
  • Demicheleite (BiSI and BiSBr), La Fossa, Vulcano, Italy. Reported in 2010 and 2008, respectively.[53][54]
  • Grigorievite, (Cu
    3    Fe3+
    2    Al
    2    (VO
    4    )    ), Second Scoria Cone, Tolbachik, Russia. Formally approved in 2015.[55]
  • Hermannjahnite (CuZn(SO
    4    )
    2    , Naboko scoria cone, Tolbachik, Russia. Reported in 2018.[56]
  • Karpovite (Tl
    2    VO(SO
    4    )
    2    (H
    2    O)    , First Cinder Cone, Tolbachik, Russia. Reported in 2018.[57]
  • Knasibfite (K
    3    Na
    4    [SiF
    6    ]
    3    [BF
    4    ]    ), La Fossa, Vulcano, Italy. Reported in 2008.[58]
  • Koksharovite, (CaMg
    2    Fe3+
    4    (VO
    4    )
    6    ), Bezymyanny, Russia. Formally approved in 2015.[55]
  • Kudriavite ((Cd
    ,    Pb)Bi
    2    S
    4    ), Kudryavy, Russia. Reported in 2004.[45]
  • Lehmannite (Na
    18    Cu2+
    12    TiO
    8    (AsO
    4    )
    8    FCl
    5    ), Arsenatnaya fumarole, Tolbachik. Discovered in 2020.[1]
  • Leonardsenite (MgAlF
    5    (H
    2    O)
    2    ), Eldfell, Heimaey, Iceland. Formally approved in 2015.[55]
  • Lesyukite (Al
    2    (OH)
    5    Cl20−
    *    H
    2    O    ), First Cone, Tolbachik, Russia. Publication in 2007 or earlier.[59]
  • Lucabindiite ((K
    ,    NH
    4    )As
    4    O
    6    (Cl
    ,    Br)    ), La Fossa, Vulcano, Italy. Described in 2010–2011.[60]
  • Majzlanite (K
    2    Na(ZnNa)Ca(SO
    4    )
    4    ), Yadovitaya fumarole, Tolbachik, Russia. Described in 2019.[61]
  • Oskarssonite, (AlF
    3    ), Eldfell, Iceland. Reported in 2018.[23]
  • Ozerovaite (Na
    2    KAl
    3    (AsO
    4    )
    4    ), Second Cinder Cone, Tolbachik, Russia. Reported in 2019.[62]
  • Parageorgbokiite (b-
    Cu
    5    O
    2    (SeO
    3    )
    2    Cl
    2    ), Yadovitaya fumarole, Tolbachik, Russia. Described in 2007.[63]
  • Parascandolaite (KMgF
    3    ), Vesuvius, Italy. Published in 2014.[64]
  • Parawulffite (K
    5    Na
    3    Cu
    8    O
    4    (SO
    4    )
    8    ), Arsenatnaya fumarole, Tolbachik, Russia. Described in 2014.[65]
  • Petrovite (Na
    10    CaCu
    2    (SO
    4    )
    8    ), Second Scoria Cone, Tolbachik, Russia. Formally approved in 2020.[66]
  • Prewittite (KPb
    1.5    Cu
    6    Zn(SeO
    3    )
    2    O
    2    Cl
    10    ), Second Scoria Cone, Tolbachik, Russia. Reported in 2013.[31]
  • Pseudolyonsite (Cu
    3    (VO
    4    )
    2    ), New Tolbachik scoria cones, Tolbachik, Russia. Reported in 2011.[67]
  • Puninite (Na
    2    Cu
    3    O(SO
    4    )
    3    ), Second scoria cone, Tolbachik, Russia. Published in 2017.[68]
  • Rhabdoborite (Mg
    12    (V
    ,    Mo
    ,    W)
    4/3    O
    6    [(BO
    3    )
    6–x    (PO
    4    )
    x    F
    2–x    ]    ), Arsenatnaya fumarole, Tolbachik, Russia. Reported in 2020.[69]
  • Russoite (NH
    4    ClAs3+
    2    O
    3    (H
    2    O)
    0.5    , Solfatara, Phlegrean Fields, Italy. Published in 2018.[70]
  • Sbacchiite (Ca
    2    AlF
    7    ), Vesuvius, Italy. Reported in 2019.[71]
  • Shcherbinaite (V
    2    O
    5    ), Izalco, El Salvador. Reported in 1983[72] and named after another discovery in Russia.[73]
  • Stoiberite (Cu
    5    V
    2    O
    10    ), "Y fumarole", Izalco, El Salvador. Reported in 1979.[73]
  • Therasiaite ((NH
    4    )
    3    KNa
    2    Fe2+
    Fe3+
    (SO
    4    )
    3    Cl
    5    , La Fossa, Vulcano, Italy. Reported in 2014.[74]
  • Topsøeite (FeF
    3    (H
    2    O)
    3    ), Hekla, Iceland. Announced in 2018.[75]
  • Wulffite (K
    3    NaCu
    4    O
    2    (SO
    4    )
    4    ), Arsenatnaya fumarole, Tolbachik, Russia. Described in 2014.[65]
  • Wrightite (K
    2    Al
    2    O(AsO
    4    )
    2    ), Second Scoria Cone, Tolbachik, Russia. Discovered in 1983.[76]
  • Ziminaite (Fe3+
    VO
    4    ), Bezymyanny, Russia. Reported in 2018.[77]
  • Zincobradaczekite (NaCuCuZn
    2    (AsO
    4    )
    3    ), Yadovitaya fumarole, Tolbachik, Russia. Described in 2020.[78]
  • Scanning electron microscope images of fumarole minerals
  • Fumarole minerals in natural colours
  • Fumarole minerals in natural colours, Mutnovsky, Kamchatka
  • Fumarole minerals in natural colours, Mutnovsky, Kamchatka
  • Photos of fumarole minerals
  • Non-SEM photo of belomarinaite from Tolbachik, Kamchatka

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